
<script lang="ts" setup name="XtxCarousel">
import {BannerItem } from '@/types/data'
import { onMounted, onUnmounted, ref } from 'vue';
  const {slides , autoplay=false , duration = 3000}= defineProps<{ 
    slides: BannerItem[]
    autoplay?: boolean
    duration?: number
  }>()
//控制高亮的下标
const active = ref(0)

const leftMove= ()=>{
  active.value--
  if(active.value < 0){
    active.value = slides.length-1
  }
}
const rightMove = ()=>{
  active.value++
  //active.value溢出了下表最大值 归0
  if(active.value > slides.length -1){
    active.value = 0
  }
}
//轮播图自动播放
let timeID :number = -1

const play = () =>{
  if(!autoplay) return

  clearInterval(timeID)
  timeID = window.setInterval(() => {
    rightMove()
  }, duration);
}

const stop = () =>{
   clearInterval(timeID)
}
onMounted(()=>{
  play()
})
//离开首页清除定时器
onUnmounted(()=>{
  stop()
})
</script>

<template>
  <div class="xtx-carousel"  @mouseenter="stop" @mouseleave="play">
    <ul class="carousel-body">
      <li class="carousel-item" v-for="(item,index) in slides" :key="item.id" :class="{ fade: active === index }" >
      <!-- fade类，让图片淡入淡出 -->
        <RouterLink :to="item.hrefUrl">
          <img
            :src="item.imgUrl"
            alt=""
          />
        </RouterLink>
      </li>
    </ul>
    <!-- 左箭头 -->
    <a href="javascript:;" class="carousel-btn prev"
    @click="leftMove"
      ><i class="iconfont icon-angle-left"></i
    ></a>
    <!-- 右箭头 -->
    <a href="javascript:;" class="carousel-btn next"
    @click="rightMove"
      ><i class="iconfont icon-angle-right"></i
    ></a>
    <!-- 小圆点 -->
    <div class="carousel-indicator">
      <span :class="{active : active===index}" v-for="(item,index) in slides" :key="item.id" @click="active = index"></span>
     
    </div>
  </div>
</template>

<style scoped lang="less">
.xtx-carousel {
  width: 100%;
  height: 100%;
  min-width: 300px;
  min-height: 150px;
  position: relative;
  .carousel {
    &-body {
      width: 100%;
      height: 100%;
    }
    &-item {
      width: 100%;
      height: 100%;
      position: absolute;
      left: 0;
      top: 0;
      opacity: 0;
      transition: opacity 0.5s linear;
      &.fade {
        opacity: 1;
        z-index: 1;
      }
      img {
        width: 100%;
        height: 100%;
      }
    }
    &-indicator {
      position: absolute;
      left: 0;
      bottom: 20px;
      z-index: 2;
      width: 100%;
      text-align: center;
      span {
        display: inline-block;
        width: 12px;
        height: 12px;
        background: rgba(0, 0, 0, 0.2);
        border-radius: 50%;
        cursor: pointer;
        ~ span {
          margin-left: 12px;
        }
        &.active {
          background: #fff;
        }
      }
    }
    &-btn {
      width: 44px;
      height: 44px;
      background: rgba(0, 0, 0, 0.2);
      color: #fff;
      border-radius: 50%;
      position: absolute;
      top: 228px;
      z-index: 2;
      text-align: center;
      line-height: 44px;
      opacity: 0;
      transition: all 0.5s;
      &.prev {
        left: 20px;
      }
      &.next {
        right: 20px;
      }
    }
  }
  &:hover {
    .carousel-btn {
      opacity: 1;
    }
  }

}
</style>

